Clonezilla is a partition or disk cloning tool
similar to Symantec Ghost. It saves and restores
only blocks in use on the hard drive if the file
system is supported. For unsupported file systems,
dd is used instead. It has been used to clone a 5
GB system to 40 clients in about 10 minutes.

Star is a very fast, POSIX-compliant tar archiver, maintained for more than 30 years.
It saves many files together into a single tape or
disk archive, and can restore individual files
from the archive. It includes command line
interfaces for the "tar", "Sun-Tar", "cpio",
"pax", and "gnutar" command-line syntax. It
includes a FIFO for speed, a pattern matcher,
multi-volume support, the ability to archive
sparse files and ACLs, the ability to archive
extended file flags, automatic archive format
detection, automatic byte order recognition,
automatic archive compression/decompression,
remote archives, and special features that allow
star to be used for full and incremental backups.
It includes the only known platform independent
"rmt" server program.

Areca is a file backup system that supports data
compression (zip / zip64 format) and encryption,
incremental backups, FTP/SFTP file transfer, delta storage mode, and many other features. It
includes a transaction mechanism, which guarantees
the integrity of your backups. Two user interfaces
are available: a command-line interface (useful
for backup automation) and a graphical user
interface (useful for backup administration).

G4L is a hard disk and partition imaging and cloning tool. The created images are optionally compressed, and they can be stored on a local hard drive or transferred to an anonymous FTP server. A drive can be cloned using the "Click'n'Clone" function. G4L supports file splitting if the local filesystem does not support writing files larger than 2GB. The included kernel supports ATA, serial-ATA, and SCSI drives. Common network cards are supported. It is packaged as a bootable CD image with an ncurses GUI for easy use.

Dar is a shell command that makes backup of a directory tree and files. Its features include splitting archives over several files, DVD, CD, ZIP, or floppies, compression, full or differential backups, strong encryption, proper saving and restoration of hard links, extended attributes, file forks, Door inodes, and sparse files, remote backup using pipes and external commands (such as ssh), and rearrangement of the "slices" of an existing archive. It can run commands between slices, before and after saving some defined files or directories (for a proper database backup, for example), and quickly retrieve individual files from differential and full backups. Several external GUIs exist as alternatives to its CLI interface, like kdar, DarGUI, SaraB, etc.

storeBackup is a backup utility that stores files on other disks. It's able to compress data, and recognize copying and moving of files and directories (deduplication), and unifies the advantages of traditional full and incremental backups. It can handle big image files with block-wise changes efficiently. Depending on its contents, every file is stored only once on disk. Tools for analyzing backup data and restoring are provided. Once archived, files are accessible by mounting file systems (locally, or via Samba or NFS). It is easy to install and configure. Additional features are backup consistency checking, offline backups, and replication of backups.

KBACKUP is intended for handling of backups no
matter whether they reside on disk or tape or even
in files. As most other backup programs available
today are either confusing the user with lots of
long command line options, or user friendly but not
powerful at all, the aim behind writing KBACKUP was
to provide a user friendly yet powerful backup
program. It is also intended to be kept compatible
to existing and well proven archive formats, so you
can restore your archives even if you should not
have KBACKUP around anymore.

BackupEDGE provides live system backup and restoration and includes the RecoverEDGE Crash Recovery package. By using this tool, you can create emergency recovery diskettes to rebuild your system in the case of a catastrophic hardware failure. RecoverEDGE handles the details of reconstructing your FDisk, divvy, and/or slice tables, rebuilding your filesystems, and restoring your data, even if your hard drive size and / or geometry has changed. RecoverEDGE uses your live system backups, so there's no need to shut down your system in order to protect it.

bew is a Web mirroring tool that will recursively get a whole set of Web pages using the HEAD mechanism so that it only downloads pages that have changed. It mostly works, but there are still a lot of features to be added. Support for checking external links is also implemented.